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Biological assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about biological assets [line items]    
Biological assets $ 290,844 $ 251,614
Percentage of reasonably possible increase in estimated costs 10.00% 10.00%
Percentage of reasonably possible decrease in estimated costs 10.00% 10.00%
Sown land – sugarcane    
Disclosure of detailed information about biological assets [line items]    
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets $ 14,700 $ 7,900
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 14,700 7,900
Sown land – crops    
Disclosure of detailed information about biological assets [line items]    
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 3,700 2,800
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 3,700 2,800
Sown land – rice    
Disclosure of detailed information about biological assets [line items]    
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 3,700 2,000
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets $ 3,700 $ 2,000